Fenris wrote: "I hated this episode. Kara isn't (or shouldn't be) stupid. She's 20 years younger than Jimmy Olsen and completely unrelated to him. He's a grown-up man and it's condescending (with a vaguely racist subtext) for her to be telling him what he can and cannot do with his life."

Kryptonians can be that way.

Unlike Clark, Kara actually had a Kryptonian upbringing, which means that she can (for example) have a prejudice against Daxamites and be pretty darn condescending to non-super-powered folks in general.